Chuck-closer.



A. F. ROBBINS.

CHUCK CLOSER.

1 ,272, 109. I Patented July 9, 1918.

Z0" 7 /9 E? 6 i 5/7 Z0 l z ff lllilii M f M ZZ l 35'/ g /4L Q UNITEDSTATES PATENT oEEIoE.

ALBERTF. ROBBINS, OF WALTHAM, MASSACHUSETTS.

)2, Y' CHUCK-CLOSER@ To all whom it may concern.' i

Be it known that I, ALBERT F. Rorns,'a citizen of the United States,residing at lValtham, in the. county 0f Middlesex and State ofMassachusetts, have'invented'new and useful Improvements inChuck-Closers, of which the followingis a specification.

This invention relates to a chuck particularly adapted to be used inconnection with lathes forholding the work inthe headstock of a lathe. YY

The object of the invention is to provide simple, powerful andy quicklyV.operated means, for closing the chuck to grip the work in theheadstock of a lathe. i The invention consists inthe Lcombination andarrangement-of parts set forth in the following specification andparticularly pointed out inthe claims thereof.

Referring to the drawings: Figure 1 is a sectional elevation of my invention, showing the same embodied in a portionl of the headstockofa'lathe.

Fig. 2 is a sectional elevation taken on line 2 2 of Fig. 1. A

Fig. 3 is a perspective view of one of the cams by means of'which'thechuck `member is actuated -to grip the work.

Like'numerals refer to like parts throughp out the several Views ofthedrawings.

In the drawings, 5 is a hollow'shaft rotatably mountedin bearings 6inthe headstock of a lathe,7said shaft being `rotated by any suitablemeans, as, .for example', by a pulley 7. Said shaft-5 is provided with ia shoulder 8 which bearsagainst the front end of the forward bearing 6.

A-'chuck memberl 9 is mounted within the hollow shaft ,5* andv slidablelongitudinally thereof,'but is prevented from rotating therein by a pin10 whichy projects into a slot 11 in the chuck member 9. Said chuckmember is made in two parts 12 and 13 which have screw-threadedengagement with each other. The part which constitutes the chuck proper12 is slitted at 14 to `forni a plurality of spring-gripping fingers 15,the forward end of said gripping fingers being inclined at 16 to engagethe front end of the bore 17 of said hollow shaft, so that lwhen thechuck member 9 is movedtoward theleft (Fig. 1), the inclined portions 16of the gripping fingers will engage the forward endof the bore of saidshaft 5 and cause said gripping fingers to be forced toward eachother togrip thework 18 and hold it firmly in posispeiiieation of Letterskraient.

Application iiieaiuiie 25, 1917. serial No. 176,694.

Patented uly 9, 191.8.

tion to be operated upon in the usual well known manner.

The rear end of the chuck member 9 has a hand wheel 19 fast thereto andsaid hand wheel is provided with a hub 20, one end of which bearsagainst la set-nut 21 which has screw-threaded engagement with the chuckmember 9, the other end of said hub being formed upon an incline 22constituting a caln. The hand wheel 19 is prevented from rotating uponthe chuck member 9 by a screw 23, the inner end of which projects intoLa slot 24 provided inthe portion'13 of the chuck member 9.

A collar 25 is rotatably mounted upon the chuck member 9 between thecam-shaped hub y2() and the rear end of lthe hollow shaft 5. One end `ofsaid collar bears against the rear end of said hollow shaft 5 and theother end of said collar is inclined to form a cam which bears againstthe inclined end 22 of the hub 20. The collarl 25, therefore, forms acam and has a series of radially extending holes 26 extendingtherethrough, each of said holes being adapted to receive a pin 27 whichis slidably mounted in a bushing 28 having screw-threaded engagementwith a collar-29 rotatably mounted upon the cam collar 25. A spring 30encircling said pin 27 acts normally to holdv said pin 27 out ofengagement with the holes 26 in the cam collar 25. The ,collar 29 isloosely mounted upon the cam collar 25 andhas a handle 31 vfast there-Ito by means of which'it maybe rocked upon the chuck member 9. i

The general operation of the device hereinbefore specifically describedis as follows: In assembling the parts the part, 12 is inserted inthebore 17 of the shaft 5 at the forward end thereof. The-,part 13 of thechuck member 9 Ais inserted in said shaft 5 from the rear end thereofand saidY two parts 12 and 13 ofthe chuck member 9 are then screwedtogether. is thenslipped onto the rear end of the part 13. The collar 29is next slipped onto the cam collar 25. The hand wheel 19 is thenslipped onto the rear end ofthe part 13, the screw 23 is screweddownwardly into the slot 21 and the set nut 21 is screwed onto thethepin 27 into one kof the holes 26.Y He thenv rotatesthe collar 29 bymeans Aof its handle.

The cam collar 25- y work 18.v

31, tliiis,lthrough lthe ypin'li27, rotating the forcedrtowardithe left(Fig. l), thus bring? i'irg the incline 1`6fof the fingers 15 againstthe forward end of-the bore of .the shaft- 5 and forcing the fingers 15toward each other, thee eeileiiletheni te erin' theiierk .1:8 firmly inorder that the ysame may be operated. upon tlileiisual` manner. Theshaft 5 may be prevented. from ,rotating while the cam collar-25y isbein-g rotated, as her-einbefore Iset forth, by holding the Ahand wheel19 or by holding thepulley 7 stationary.V When the maehine ie. i111Operation to Operate; urenthe k 18;, the collar 29 and handle 3l remainstationary, asthe collar 29 is loose. upon the' collar 25 .and the,handle 3l will be caused by gravity to stand in a perfectlyperpendicular position, kany tendency of the collar 29 to be rotated byfriction will be overcome.: s

Vhenf it is desired to reinove .the work freinJ the lathe the 10am,eolien 25 ie rotated, asheneinbefore described, but inthe oppof sitedirection, thus allowing the chuck inemchuck member at yOneend 0f' Saidhollow ber 9j tobe moved forwardly yand. ,causing the -iiiigers l5 lto lrelease the ,work 1 8 so that it may be removed from thelathe.,

. IlavineV thus describedm invention what e, v Y y Itelaim' desire bycure is: l a 1. A chuckcloser having, in combination,

Letters Patent to se'- al` hollowfshazfili il chuck member extending'tlMQiigfh Said shaft, gripping; ngers on -said shaftladapted toengagesaidhollow shaft andube OIcedA towardgeach other when saidchuckiinember is moved longitudinally thereofinlonefdir'ection, :a camfast to saidchuck memb-e r {aaiother cam rotatably. mounted fo-n, saidchuck member between .said firstfnained camf andA said shaft and:bearing against the end-,offsaid shaft. opposite that end thereofadjacent to :said gripping fingers, means ro-V tatably mountedon saidlastfnamed cam-and aunanually operable device to lock said lastnamedmeans and 1 cam together' Wlhereby said chuck member may be movedlongitudinally within'` saidl shaftl and said lingers moved towardeachother.

Y A' chuck closerY having, inf combination, a hollow shaft,'a chuckmember extending through saidshaft, gripping lingers onsaid chuck memberlat one end of saidy hollow shaftgadapted to engage said hollow shaftand' beforced toward each other when moved longitudinally of said hollowshaft in one direction, a.V cam rotatably mounted on said chuck memberand bearing 'against they opposite endv ofV said' hollow .shaft fromthat-"at Awhich said gripping lingers are located, a member'fast tos'aid'chuck member and engaging said camfaiid means to rotate said cam onsaid chuck member, whereby saidfehuckfmember-may'be moved longitudinallyof said hollow shaft and said gripping fingersV moved toward each other,a collar rotatably mounted upon said cam and a pin sl'idably Vmountedupon said `col-lar and adaptedto ,be ,moved into a hole provided in saidcam, whereby, when said collar is rotated, said camzwillbe .rotated andsaid chuckinember moved longitudinally thereof to force said lingerstoward each other'. v

3.- A, ,ehuckcloser having, in combination,

a hollow shaft,vv achuek member extending,

through sai-debate grppingrngers; en Seid chuckmember at one end. ofSaid: hollow shaft, adapted to engageL said hollow shaft and be. Aforcedtoward each other when moved longitudinally of said hollow shaft in onedirection, a cam rotatably mounted on said lchuck member and bearingagainst the opposite,end of7 said hollow; shaftv from that at which saidgripping iingersare. located,

a member fasti to said chuckmember andengaging said; camandmeanstorotate said cam o n-said chuck member, wherebysaid chuck; member be,moved longitudinally of said hollow shaft andsaid gripping fingersmoved toward. eachother, a collar ,4. A: chuck; closer having,combination,

a7 hollow shaft, a chuck member: extending: throughsaid-shaft,Ygrippingugers Yon said chuck member 'atl one" end of'saidhollowY shaft, adapted to engage said hollow 'shaft -f and :be forcedtowardzeachfotherwhenfmoved longitudinally of saidhollow shafty in onedirection, cain rotatably lmounted :on said chuck member and 4bearinagainst the opposite endofsaid-hoil-low s4 a=ft from'thatatf which saidgrippingngers are located, aV

member." fast Lto saidchuck member'and eri-- gagingjsaid caml aiidfmeans V'to rotate l said camu on said chuck-'membeig whereby said chucklmember' .may be L moved 1 longitudinally of said hollow shaftE and saidgripping fingers moved toward each other, a -collar lrotatably mountedupon said cam,afp in slida-.bly mounted: in saidl collar and adapteditfoengage a hole in said1cam,-and aspring actingto normally" holdsaidpin-fout of i'said hole, whereby,- w-hen said `pin ispushedl intosaid hole said' 1collar rotated,- said cam; will' be' simultaneouslyrotated and said chuckmembery moved longitudinally *thereof* to forcesaid' lingers toward' each other.

5. A chuck closer having, in combination, a hollow shaft, a chuck memberextending through said shaft, gripping fingers on said chuck member atone end thereof adapted to engage said hollow shaft and be forced towardeach other when moved longitudinally thereof in one directi0n,a handwheel fast to said chuck member and adjustable longitudinally thereof, ahub on said hand Wheel having one end thereof inclined to form a cam, acollar rotatably mounted upon said chuck member between said hand Wheeland said shaft, one end thereof being inclined to form a cam and bearingagainst the inclined end of said hand Wheel hub, theother end of saidcam collar arranged to bear against the end of said shaft opposlte thatend at which said gripping fingers are located, said cam collar having aplurality of holes extending radially therethrough, a collar rotatablymounted upon said cam collar, and a pin slidably mounted on saidlast-named collar and adapted to project into any one of the holes insaid cam collar, whereby, when said last-named collar is rotated, saidcam collar will be rotated and said ckglck member moved longitudinallythereof i said hollow shaft and said fingers forced toward each other,

In testimony whereof I have hereunto set 30 my hand in presence of twosubscribing witnesses.

ALBERT F. ROBBINS. Witnesses CHARLES S. GooDING, SYDNEY E. TAFT.

Copies of this patent may be obtained for ve cents each, by addressingthe commissioner of Patents,

Washington, D. G. l

